.outer {
    position: relative;
    width: 100vw;
    height: 100vh;
}

.container {
    width: 100%;
    height: 100%;
    display: flex;
    /* 确保 container 在底层 */
    z-index: 1;
}

.login_box {
    position: absolute;
    top: 45%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: #ffffff;
    flex-direction: column;
    border-radius: 5px;
    border: 0px solid #E4ECF6;
    width: 400px;
    height: 290px;
    align-items: center;
    justify-content: center;
    display: flex;
    box-shadow: 10px 10px 20px #888888;
    /* 确保 login_box 在上层 */
    z-index: 2;
    /* 半透明效果 */
    opacity: 0.9;
}

.title_box {
    margin-top: 10px;
}

.title_str {
    margin-left: 7px;
}

.user_name_box {
    margin-top: 25px;
    justify-content: center;
    display: flex;
    width: 100%;
}

.user_name {
    height: 37px;
    width: 75%;
}

.user_pwd_box {
    margin-top: 15px;
    justify-content: center;
    display: flex;
    width: 100%;
}

.user_pwd {
    height: 37px;
    width: 75%;
}

.login_button {
    width: 75%;
    margin-top: 45px;
}